Galvanizing-furnace.



No. 663,033. Patented Dec. 4, I900. H. B. LYNCH.

GALVANIZING FURNACE.

(Application filed June 2, 1899.) I (No Model.) 2 Sheets$heat I.

| l i l l I fizwe 03 TH: NORRIS wzrsns 0o, ruo'mumon wasnmnmu u c No.663,033. Patented Dec. 4, I900. H. B. LYNCH.

GALVANIZING FURNACE.

(Application filed June 2, 1899.) (No Model.) 7 2 Sheets-Sheet 24 m:NORRIS PETERS coy, PNDTO-LITHOH wAsmNmTc-N, n cy Nirn HARRY B. LYNCH, OFVERSAILLES, PENNSYLVANIA.

GALVANIZJNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 663,033, dated December4, 1900.

Application filed June 2, 1899. Serial No. 719,059. (No model.)

lowing to be a full, clear, and exact description thereof.

Myinvention relates to the heating of pots containing galvanizing orother metal used for coating. Its object is to provide a suit: ablefurnace for work of this character in which generator or like lowquality of fuelcan be used and in which provision is.

made for varying the heat in the furnace so as to properly heat themetal in the pot; for applying the heat to the upper part of the metalin the pot, so as to avoid, as far as possible, the making of dross,which comes from overheating of the metal; forqnickly and rapidlycoolingt he pot,which is a necessity as soon as the coating isdiscontinued, such as at the end of a days work, to prevent burning oroxidizing of the coating metal; for heating the incoming gases by theout-going product-s and to some extent for heating the air supportingcombustion; to provide access to any of the gas-fines, both for cleaningor burning out and in case the pot should burn through so that thespelter or other metal would run down into the gas-fines, and forquickly collecting and withdrawing such metal from the fines, anecessity especially in the employment of pot-s used for coating longpipe and bar where a very large body of metal must be employed.

The particular points of invention desired to be covered will behereinafter described in detail and claimed.

To enable others skilled in the art to make and use my in vention, Iwill describe the same more fully, referring to the accompanyingdrawings, in which Figure 1 is a horizontal section of. the furnace andpot on the line 1 1, Fig. 2. Fig. 2 is in part a side view and in part asection, being made on the line 2 2, Fig. 1; and Figs. 3 and 4 arecross-sections on the lines 3 3 and 4 4, respectively, Fig. 1.

Like letters indicate like part-s in each of the figures.

My inventionis applied to the same class of furnace as shown in PatentNo. 419,695, granted upon my invention January 21, 1890, which providesfor the use of natural gas or other high-heating gas; but the presentfurnace is constructed so as to utilize for heating a low-heating gas,generally known as producer or generator gas, which is formedcontinuously by the passage of air through a body of fuel and whichrequires different conditions for working from such rich gases as can becarried to the furnace in ordinary pipes.

The furnace shown is one suitable for the coating of pipe or bar and istherefore made of considerable length, the ordinary wroughtmetal pipebeing about eighteen to twenty feet in length and the furnace being madesomewhat longer to provide for the proper handling of the pipe. Whilethe pot is made comparatively long, it is narrow, as shown, though thepot illustrated is wider than the usual pots, because the pot A has achargingsection a and a withdrawing-section 1), these sections beingseparated by a longitudinallyextending partition 0 entering from abovepart way into the metal of the pot, and the section a containing thesal-ammoniac or other like material through which it is considereddesirable to introduce the pipe into the coating-bath. The pot A isformed of wrought metal in the usual way, and though it may containpeculiar mechanism for the handling of the pipe the same forms no partof the present invention and is not illustrated, the pot showing simplythe inclined guide-bars a from the charging-section into thewithdrawing-seotion. The pot A rests upon the supporting-wall D, throughwhich the waste-gas due or fines (1 pass, it being preferred, for theproper working of the furnace and also to bring the same as close aspracticable to the gas-fines, that the wastegas flue shall be dividedcentrally into two sections d d by the wall (1 The waste-gas flueextends for the full length of the furnace. On each side of thiswaste-gas flue, separated therefrom by the walls 6 are the gas-supplyflues ee' orff. Asillustratedin the drawings, these fiues extend in fromopposite ends of the furnace toward each other, the tines e and f beingon one side of the furnace and meeting between the ends and beingseparated by furnace.

the wall a one flue being preferably shorter than the other, as shown,in the proper work'- ing of the furnace, and the flues ef being on theother side of the furnace and located in like manner. It will be notedthat these flues are open and that the bases thereof are inclineddownwardly and outwardly toward the outer walls 9 of the furnace. Openfines are formed because of the liability of the pets to burn out anddischarge the spelteror metal into the combustion-chambers, from whichit will pass'into these lines, and the inclined bases thereof providemeans for tapping the metal from such fines and collecting it withoutthe necessity of tearing down the entire For this purpose it will benoted that at intervals in the walls 9 are pockets or recessesg,extending from the fines toward the outer face of the wall, into whichsuch metal will naturally gather and from which it can be tapped bywithdrawing the brickwork closing such pockets. The several gasfiues arecontrolled by suitable gas-valves f located at the ends of the furnace.The masonry inclosing the gas-fines and the wasteproduct flues extendsup about on a line with the base of the pot, and extendinglongitudinally. of the pot and from the base thereof up to the topthereof on each side are the series of combustion-chambers h h k it,these series of chambers corresponding in length and position to thegas-supply flues e e f f ,respectively, the series h k and hrespectively, being separated by the walls h as shown in Fig. 1, whilethe individual chambers of each series are separated by the walls hLeading upwardly from the gas-supply flues and opening into the bases ofthe combustion-chambers are the gas-supply ports 2', one for eachcombustion-chamber, while the air ports Z enter horizontally into thebases of the combustion-chambers, as shown in Fig. 3. It will be notedthat to protect the base of the pot I form the tile sheathing i, whichdeflects the gas upwardly toward the upper end of thecombustion-chamber, the airpassing over the top of the gas-fines andmeeting the gas as it rises throughthe ports 1' and forming combustionin the chambers 71 h k is. The bases of the air-flues are flat, asshown, and supported in the same are the tiles t in position to be slidover the gas-port 11 and close the same, so regulating the supply of gasfrom each port to the combustion-chamber. I prefer for the purpose ofheating the incoming air to form along the sides of the furnace theair-chambers m m, which are formed by means of the vertical walls msupported on pillars m upon which metal bar-supports m rest, the tops ofsaid chambers being closed by the tiles m resting on the walls m and onbrickwork projecting from the sides of the furnace. the pillars m risesin contact with the inclosing wall, absorbing heat therefrom before itenters the horizontal air-fines 1. These airflues themselves are,however, maintained at In this way the air enters betweenconsiderableheat both by the initial combustion in the combustion-chambers and alsoby the gases in the escape-fines pp 1' 0", into which the products passfrom the combustionchambershhk lcthroughthefiues fi Where such outerair-chambers m m are employed, suitable ports 'm are formed through thesame to provide for adjusting the tiles '5 over the gas-ports 1', theseports m being closed by blocks. The gas and air after meeting at thebases of the combustion chambers is burned therein, and the flame andheated products travel upwardly along the pot and within thecombustion-chambers, and thence through the ports p into thelongitudinallyextending escape-fines p p 'r 0" above referred to. Thesefines are made of the same length as the respective gas-fines and seriesof combustion flues above described, the chambers p p r 1* beingseparated by the partition-walls b above referred to. In this way eachparticular section of the furnace is under the control of the operatorthrough the valve f controlling the supply of gases thereto, and theheat of the pot can be regulated by the admission of more or less gas toeach section, the gas passing from the gas supply flue of each sectioninto its combustion-chamber, and thence into its escapeof order theother three sections may be utilized to keep up the heat and provide forthe running of the pot, though of course not as perfectly as where theheat can be regulated as above described.

It will be noted that at each end of the furnace is the transverseescape-flue s or 8', extending for the full width of the furnace, theescape-fines p 10 Opening into the fine 3 and the escape-fines r ropening into the fine 5.

These flues s and s communicate by downtake-openings into thewaste-product flue or tunnel d, and the waste products from the fiues p10 enter the flue s and travel forward under the pot and for its entirelength traveling through the tunnels or ports d d or the single tunnel din contact with the partitionwalls 6 separating the same from thegasflues and serving in this way to heat the incoming gases, such wasteproducts then passing to the stack T. For the proper heating and workingof the furnace it is found desirable that the sections of the tunnel 61shall be controlled so as to throw greater or less heat into contactwith one or the other gasflue, and for this purpose the partition-wall Afurther important advantage (1 between the two fines d d is carriedlongitudinally and centrally across below the flue s, as shownparticularly at tin Fig. 4, the upper end of said wall being preferablyspread so as to support the tile-plate t, which can be adjusted fromside to side, so as to close the port 1? or 15 leading from saidcrossflue .9 down into the tunnel-fines d or d It will also be noticedthat the end walls a of the pot are exposed to the heat within thecross-fines s or s. This is important in providing for maintaining theheat at the ends of the pots, where on account of the handling of thepipe the metal is liable to be cooled. In this way a high heat canalways be main- \ained at the end portions of the pot and the chillingaction of the metal consequent to its agitation be overcome.

\Vhen the furnace is in operation, the incoming gas enters the gas fluesor tunnels e f e f and rises through the ports 13, meeting the airentering through the air-ports Z and burning in the bases of thecombustion-chambers 71, 7t 77/ 7c, rising therein in contact with thepot-walls, and thence passing horizontally into the fines 1) r17 1",through which they pass to the end or cross flues s or s and into thewaste-product tunnel or tunnels, the heated products from the cross-flues traveling forward through the same in contact with the dividing-walls6 between the same and the gas-flue, so as to heat the incoming gas. Inthis way it is found that the necessary heat for these galvanizing orlike pots can be maintained without any further heating of theproducer-gas and that the heat of the pot can be regulated so that themetal can be kept in perfect condition for working while the heat is notso high as to rapidlyburn through the walls of the pot and destroy thesame, a difficulty found in the heating of these pots with rich gas andwhich must be carefully guarded against. The heat can also be regulatedin the different sections, as above described, so that the metal ismaintainedin as nearly perfect condition as possible for coating, whilethemetal at the ends of the pot is also heated through the exposure ofthe end portions thereof within the end or cross fines. Practical usehas shown it desirable that the rear sections supplied with gas from thefines e 6 shall be made longer than those supplied with gas from theflues ff on account of the peculiar working of the pot and the necessityof maintaining the withdrawing end somewhat hotter than the other end. I

A very important point in the operation of these furnaces is to preventthe drossing of the metal in rapid working of the furnace where a largetonnage is coated per day. It is necessary in so working to maintain themetal quite hot, keeping it cool by the rapid passing of the pipethrough the same, the pipe absorbing the heat from the metal, it beingfound that the pipe must be raised to a certain temperature before thecoating metal willpermanentlyunitetherewith. Onegreat difficulty withthis way of working, however, is that where the furnace is run at suchhigh heat as to keep the metal hot enough for this rapid work as soon asthe coating operation is discontinued the furnace will overheat themetal in the pot and lead to very serious loss in drossing or oxidizing.The present furnace has great advantages in overcoming suchdifficulties, as the operator need only close off the gas-supply andopen the stack wide, when the draft or suction of the same will draw theair in through the air-chambersmm and the air-fines Z into thecombust-ion-ehambers and into contact with the pot, so providing for therapid, cooling down of the pot the instant that the gas-supply is cutoff.

What I claim my invention, and desire to secure by Letters Patent, is-

1. A furnace for galvanizing and like pots havinglongitudinally-extending gas-supply flues on each side of and below thelevel of the pot, combustionchambers on each side of the pot andextending up the walls thereof, outlet-fines extending longitudinally ofthe pot outside of the combustion-chambers, and gas-ports leading fromthe gas-supply fines vertically into the combustion-chambers andair-supply ports leadinghorizontally into the same, substantially as setforth.

2. A furnace for galvanizing and like pots, havinglongitudinally-extending gas-supply fines on each side of and below thelevel of the pot, com bustion-chambers on each side of the pot andextending up the walls thereof, outlet fiues extending longitudinally ofthe pot outside of the combustion-chainbers, gasports leading from thegas-supply fines vertically into the combustion-chambers and airsupplyports leading horizontally into the same, and sliding tiles in theair-ports for regulating the gas-ports, substantially as set forth.

3. A furnace for galvanizing and like pots, havinglongitudinallyextending gas-supply flues on each side of and below thelevel of the pot, combustion-chambers on each side of the pot andextendingup the walls thereof, outlet-fines extending longitudinally ofthe pot outside of the combustion-chambers, gasports leading from thegas-supply fines vertically into the combustion-chambers and airsupplyports leading horizontally into the same, a cross-port at the end of thefurnace with which the outlet-ports communicate and a tunnel escape-fineextending longitudinally under the pot, substantially as set forth.

4:. A furnace for galvanizing and like pots, having a substructuresupporting the pot provided with a longitudinally-extendingwaste-product tunnel under the same and longitudinally-extendinggas-fines on each side of said tunnel, combustion-chambers on each sideof the pot, gas-ports leading from the gas-fines upwardly into thecombustionchambers, and fines connecting the combustion-chambers withthe waste-product tunnel, substantially as set forth.

IIO

5. A furnace for galvanizing or like pots, having a substructuresupporting the pot and provided with gas-fines extending longitudi-.

nally thereof and having floors inclined outward-1y and downwardly,combustion-chambers extending along the sides of the pot and gas-supplyports leading upwardly from the gas-fines into said combustion-chambers,substantially as setforth.

6. A furnace for galvanizing or like pots, having a substructuresupporting the pot and provided with gas-fines extending longitudi-.

nally thereof and having floors inclined outwardly and downwardly,combustion-chambers extending along the sides of the pot, gassupplyports leading upwardly from the gasflues into said combustionchambers,and pockets in the gas-fines extending part way through the side walls,substantially as set forth.

7. A furnace for galvanizing and like pots, having gas-supply lines oneach side of and below the level of the pot, combustion-chambers on eachside of the pot and extending up the walls thereof, outlet-finesextending longitudinally of the pot outside of the combustion-chambers,gas'ports leading from the gas-supply flues vertically into thecombustion-chambers and air-supply ports leading horizontally into thesame, and air-cnam hers extending longitudinally of the furnace outsidethe gas-supply fines and communicating with the air-ports, substantiallyas set forth.

8. A furnace for galvanizing or like pots, having on each side thereofbelow the level of the same, longitudinal gas-supply flues, eachextending part way of the length of the furnace, combustion chambersextending along the sides of the pot, ports leading from the respectivegas-supply fiues vertically into said combustion chambers, andlongitudinally-extending outlet-fines outside the combustion-chambersand communicating therewith, each gas-supply flue having its owncombustion-chambers and outlet-flue, substantially as set forth.

9. A furnace for galvanizing or like pots, havinglongitudinally-extending gas-supply lines below the level of the pot andextending part way of its length, combustion-chambers extending alongthe sides of the pot, ports leading from the gas-supply flues into therespective combustion chambers, air ports leading horizontally into thecombustionchambers, longitudinally-extending outletflues with which therespective combustionchambers communicate, an escape-tunnel, andcross-fines communicating with the outlet-fines and opening downwardlyinto the escape-tunnel, substantially as set forth.

l0. A furnace for galvanizing or like pots, havinglongitudinally-extending gas-supply lines below the level of the pot,combustionchambers extending along the sides of the pot, ports leadingfrom the gas-supply lines into the combustion chambers,longitudinally-extending outlet-fines outside the combustion-chamberswith which they communicate, an escape-tunnel, and a cross-fluecommunicating with the outletlines and opening downwardly into theescape-tunnel, the end wall of the pot being exposed within suchcross-flue, substantially as set forth.

11. A furnace for galvanizing or like pots, havinglongitudinally-extending gas-supply flues e, 6 below the level of thepot,-and extending part way of its length, combustionchambers h, hextending along the sides of the pot, ports 2', leading from eachgas-sun ply flue into the respective combustion-chambers, air-ports Z,longitudinally-extending outlet-fines p, p with which the respective combustion-chambers communicate, a wasteproduct tunnel extendinglongitudinally under the pot, and a cross-flue 8, com municating withthe outlet-fines and opening downwardly into the waste-product tunnel,substantially as set forth.

12. .A furnace for galvanizing or like pots, havinglongitudinally-extending gas-supply flues below the level of the pot,combustionchambers extending along the sides of the pot, ports leadingfrom the gas-supply flues into the combustion chambers,longitudinally-extending outlet-fines with which the respectivecombustion-chambers communicate, a waste-product tunnel extendinglongitudinally under the pot, a cross-flue communicating with theoutlet-fines and opening downwardly into the waste-product tunnel, thewall (1 dividing the waste-product tunnel into two sections and havingthe portion t extending under the cross-flue, and the deflecting-plate25 supported on the wall 15, substantially as set forth.

In testimony whereof I, the said HARRY B. LYNCH, have hereunto set myhand.

HARRY B. LYNCH.

Witnesses:

FRANCES D. SooTT, ROBERT C. TOTTEN.

